Effect of gold doping on relativistic electron beam transport in high-density plasma

doi:10.1088/1674-1056/add4df

中国物理B ›› 2025, Vol. 34 ›› Issue (7): 75201-075201.doi: 10.1088/1674-1056/add4df

Effect of gold doping on relativistic electron beam transport in high-density plasma

Zi-Yan Zhang(张子彦)^1,2 and Wei-Min Wang(王伟民)^1,2,3,†

1 School of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China;
2 Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education), Renmin University of China, Beijing 100872, China;
3 Key Laboratory for Laser Plasmas & School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

收稿日期:2025-02-25 修回日期:2025-04-22 接受日期:2025-05-07 出版日期:2025-06-18 发布日期:2025-06-18
通讯作者: Wei-Min Wang E-mail:weiminwang1@ruc.edu.cn
基金资助:
Project supported by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant Nos. XDA25050300 and XDA25010100), the National Key R&D Program of China (Grant No. 2018YFA0404801), the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China (Grant No. 20XNLG01).

Effect of gold doping on relativistic electron beam transport in high-density plasma

Zi-Yan Zhang(张子彦)^1,2 and Wei-Min Wang(王伟民)^1,2,3,†

1 School of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China;
2 Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education), Renmin University of China, Beijing 100872, China;
3 Key Laboratory for Laser Plasmas & School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2025-02-25 Revised:2025-04-22 Accepted:2025-05-07 Online:2025-06-18 Published:2025-06-18
Contact: Wei-Min Wang E-mail:weiminwang1@ruc.edu.cn
Supported by:
Project supported by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant Nos. XDA25050300 and XDA25010100), the National Key R&D Program of China (Grant No. 2018YFA0404801), the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China (Grant No. 20XNLG01).

摘要/Abstract

摘要： We investigate the influence of gold doping on the transport range of a relativistic electron beam in high-density deuterium-tritium (DT) fuel, which could be encountered in the double-cone ignition laser fusion. We develop the stopping power model to include gold doping and then analyze the influence of Coulomb collision and bremsstrahlung on the electron transport range with different gold doping ratios, consistent with the Geant4 simulations. When the gold doping ratio increases from 0.5% to 30%, the transport range of a 10 MeV electron beam is decreased by 9.6% and 18.5% via the bremsstrahlung. For the 1 MeV beam, the decrease of the range becomes 0.7% and 1.0%. We also investigate the transverse broadening of the electron beam and radiated photon energy reabsorption in a spherical target. When the gold doping ratio is 2% and the beam energy is increased from 1 MeV to 5 MeV, the bremsstrahlung photons cover 2.6% to 10.3% of the total beam energy. Meanwhile, the reabsorbed photon energy is reduced from 31.6% to 8.9%.

关键词: double-cone ignition (DCI) scheme, stopping power, Geant4, bremsstrahlung

Abstract: We investigate the influence of gold doping on the transport range of a relativistic electron beam in high-density deuterium-tritium (DT) fuel, which could be encountered in the double-cone ignition laser fusion. We develop the stopping power model to include gold doping and then analyze the influence of Coulomb collision and bremsstrahlung on the electron transport range with different gold doping ratios, consistent with the Geant4 simulations. When the gold doping ratio increases from 0.5% to 30%, the transport range of a 10 MeV electron beam is decreased by 9.6% and 18.5% via the bremsstrahlung. For the 1 MeV beam, the decrease of the range becomes 0.7% and 1.0%. We also investigate the transverse broadening of the electron beam and radiated photon energy reabsorption in a spherical target. When the gold doping ratio is 2% and the beam energy is increased from 1 MeV to 5 MeV, the bremsstrahlung photons cover 2.6% to 10.3% of the total beam energy. Meanwhile, the reabsorbed photon energy is reduced from 31.6% to 8.9%.

Key words: double-cone ignition (DCI) scheme, stopping power, Geant4, bremsstrahlung

中图分类号: (Fast ignition of compressed fusion fuels)

52.57.Kk

52.20.Hv (Atomic, molecular, ion, and heavy-particle collisions) 52.65.Pp (Monte Carlo methods)

Zi-Yan Zhang(张子彦) and Wei-Min Wang(王伟民). Effect of gold doping on relativistic electron beam transport in high-density plasma[J]. 中国物理B, 2025, 34(7): 75201-075201.

Zi-Yan Zhang(张子彦) and Wei-Min Wang(王伟民). Effect of gold doping on relativistic electron beam transport in high-density plasma[J]. Chin. Phys. B, 2025, 34(7): 75201-075201.

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Effect of gold doping on relativistic electron beam transport in high-density plasma

Effect of gold doping on relativistic electron beam transport in high-density plasma

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